A gas at 350 K and 15 bar has a molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is:

1.	Z<1 and repulsive forces are dominant.
2.	Z>1 and attractive forces are dominant.
3.	Z>1 and repulsive forces are dominant.
4.	Z<1 and attractive forces are dominant.

If a gas expands at a constant temperature, it indicates that:

1. Kinetic energy of the molecules decreases

2. The pressure of the gas increases

3. The kinetic energy of the molecules remains the same

4. The number of molecules of gas increases

The energy absorbed by each molecule (A₂) of a substance is 4.4 x 10^-19 J and bond energy per molecule is 4.0 x 10^-19 J. The kinetic energy of the molecule per atom will be:

1. $2.0\times {10}^{-20}$ $J$

2. $2.2\times {10}^{-19}$ $J$

3. $2.0\times {10}^{-19}$ $J$

4. $4.0\times {10}^{-20}$ $J$

50 mL of each gas A and of gas B takes 200 and 150 s respectively for effusing through a pinhole under the similar conditions. If the molecular mass of gas B is 36, the molecular mass of gas A will be:

1. 96

2. 128

3. 32

4. 64